x = int(input())
print("Yes" if x >= 30 else "No") x = int(input()) x int(input()) int input() input print("Yes" if x >= 30 else "No") print "Yes" if x >= 30 else "No" x >= 30 x 30 "Yes" "No" x = int(input()) int(input()) x
x = int(input())
print("Yes" if x >= 30 else "No")
